给你个我用的例子：
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; 脚本用 Inno Setup 脚本向导生成。; 查阅文档获取创建 INNO SETUP 脚本文件详细资料![Setup]AppName=Common downloaderAppVerName=Common downloaderDefaultDirName={pf}\XXX\Common downloader
DefaultGroupName=XXX\Common downloaderDisableProgramGroupPage=yesOutputDir= .\SetupOutputBaseFilename=Common downloader setup V1.0.0
Compression=lzmaSolidCompression=yesVersionInfoCompany=XXXVersionInfoVersion=1.0.0
[Languages]Name: "Chinese"; MessagesFile: "compiler:Languages\Chinese.isl"
Name: "English"; MessagesFile: "compiler:Languages\English.isl"
[Tasks]Name: "desktopicon"; Description: "{cm:CreateDesktopIcon}"; GroupDescription: "{cm:AdditionalIcons}"; Flags: dontinheritcheck
[Files]Source: "CMDL.exe"; DestName: "Common downloader.exe"; DestDir: "{app}"; Flags: ignoreversion
Source: "DL.dll"; DestDir: "{app}"; Flags: ignoreversion
Source: "DM.dll"; DestDir: "{app}"; Flags: ignoreversion
Source: "config.ini"; DestDir: "{app}"; Flags: ignoreversion
Source: "App\*"; DestDir: "{app}\\App"; Flags: ignoreversion recursesubdirs createallsubdirs
Source: "Boot\*"; DestDir: "{app}\\Boot"; Flags: ignoreversion recursesubdirs createallsubdirs
Source: "Resource_cn\*"; DestDir: "{app}\Resource"; Languages: Chinese; Flags: ignoreversion recursesubdirs createallsubdirs
Source: "Resource_en\*"; DestDir: "{app}\Resource"; Languages: English; Flags: ignoreversion recursesubdirs createallsubdirs
; 注意: 不要在任何共享系统文件中使用“Flags: ignoreversion”[Icons]Name: "{group}\Common downloader"; Filename: "{app}\Common downloader.exe"
Name: "{group}\{cm:UninstallProgram,Common downloader}"; Filename: "{uninstallexe}"
Name: "{userdesktop}\Common downloader"; Filename: "{app}\Common downloader.exe"; Tasks: desktopicon
[Run]Filename: "{app}\Common downloader.exe"; Description: "{cm:LaunchProgram,Common downloader}"; Flags: nowait postinstall skipifsilent
[Registry]Root: HKLM; Subkey: "Software\XXX"; Flags: createvalueifdoesntexistRoot: HKLM; Subkey: "Software\XXX\Common downloader"; Flags: uninsdeletekeyifemptyRoot: HKLM; Subkey: "Software\XXX\Common downloader"; ValueType: string; ValueName: "Path"; ValueData: "{app}"
Root: HKLM; Subkey: "Software\XXX\Common downloader"; ValueType: string; ValueName: "Version"; ValueData: "V1.0.0"
Root: HKLM; Subkey: "Software\XXX\Common downloader"; ValueType: dword; ValueName: "VersionNum"; ValueData: "100"
Root: HKLM; Subkey: "Software\XXX\Common downloader"; ValueType: string; ValueName: "Release Date"; ValueData: "2008/09/29"
[Code]function InitializeSetup(): Boolean;
var Version: string;
strPath: string;
ResultCode: Integer;
begin Result:= TRUE;
//read the version
if RegQueryStringValue(HKEY_LOCAL_MACHINE, 'Software\XXX\Common downloader',
'Version', Version) then
begin
// Successfully read the value
Version := Format('Exist the version %s,whether uninstall it?',[Version]);
if MsgBox(Version,mbConfirmation,MB_YESNO) = IDYES then
begin
//read the path
if RegQueryStringValue(HKEY_LOCAL_MACHINE, 'Software\XXX\Common downloader',
'Path', strPath) then
begin
// Successfully read the value
strPath:= strPath + '\unins000.exe';
Exec(ExpandConstant(strPath), '', '', SW_SHOW,
ewWaitUntilTerminated, ResultCode);
end;
end else
Result:= FALSE;
end;
end;
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这个例子可以在安装之前卸载以前的版本，并提示你卸载之前的版本信息。